fix(docs): Update Vietnamese templates section and remove outdated README files

- Changed the label from 'Mẫu' to 'Templates' in the Vietnamese documentation for consistency.
- Deleted outdated README.md files for both English and Vietnamese templates to streamline documentation and reduce clutter.
- This update aims to enhance clarity and maintain a more organized structure in the documentation.

apps/web-docs/.vitepress/config.mts

@@ -82,7 +82,7 @@ export default withMermaid(defineConfig({
                     { text: 'Trang chủ', link: '/vi/' },
                     { text: 'Hướng dẫn', link: '/vi/guides/getting-started' },
                     { text: 'Kiến trúc', link: '/vi/architecture/system-design' },
-                    { text: 'Mẫu', link: '/vi/templates/' }
+                    { text: 'Templates', link: '/vi/templates/' }
                 ],
                 sidebar: {
                     '/vi/guides/': [
@@ -120,7 +120,7 @@ export default withMermaid(defineConfig({
                     ],
                     '/vi/templates/': [
                         {
-                            text: 'Mẫu',
+                            text: 'Templates',
                             items: [
                                 { text: 'Tổng quan', link: '/vi/templates/' },
                                 { text: 'Node.js Template', link: '/vi/templates/nodejs-template' },